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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package iptables
import (
"crypto/rand"
"fmt"
"math/big"
"reflect"
"testing"
)
func randChain(t *testing.T) string {
n, err := rand.Int(rand.Reader, big.NewInt(1000000))
if err != nil {
t.Fatalf("Failed to generate random chain name: %v", err)
}
return "TEST-" + n.String()
}
// Create an array of IPTables with different hasWait/hasCheck to
// test different behaviours
func mustTestableIptables() []*IPTables {
ipt, err := New()
if err != nil {
panic(fmt.Sprintf("New failed: %v", err))
}
ipts := []*IPTables{ipt}
// ensure we check one variant without built-in locking
if ipt.hasWait {
iptNoWait := &IPTables{
path: ipt.path,
hasWait: false,
}
ipts = append(ipts, iptNoWait)
}
// ensure we check one variant without built-in checking
if ipt.hasCheck {
iptNoCheck := &IPTables{
path: ipt.path,
hasCheck: false,
}
ipts = append(ipts, iptNoCheck)
}
return ipts
}
func TestChain(t *testing.T) {
for _, ipt := range mustTestableIptables() {
runChainTests(t, ipt)
}
}
func runChainTests(t *testing.T, ipt *IPTables) {
t.Logf("testing iptables (hasWait=%t, hasCheck=%t)", ipt.hasWait, ipt.hasCheck)
chain := randChain(t)
// chain shouldn't exist, this will create new
err := ipt.ClearChain("filter", chain)
if err != nil {
t.Fatalf("ClearChain (of missing) failed: %v", err)
}
// chain now exists
err = ipt.ClearChain("filter", chain)
if err != nil {
t.Fatalf("ClearChain (of empty) failed: %v", err)
}
// put a simple rule in
err = ipt.Append("filter", chain, "-s", "0.0.0.0/0", "-j", "ACCEPT")
if err != nil {
t.Fatalf("Append failed: %v", err)
}
// can't delete non-empty chain
err = ipt.DeleteChain("filter", chain)
if err == nil {
t.Fatalf("DeleteChain of non-empty chain did not fail")
}
err = ipt.ClearChain("filter", chain)
if err != nil {
t.Fatalf("ClearChain (of non-empty) failed: %v", err)
}
// rename the chain
newChain := randChain(t)
err = ipt.RenameChain("filter", chain, newChain)
if err != nil {
t.Fatalf("RenameChain failed: %v", err)
}
// chain empty, should be ok
err = ipt.DeleteChain("filter", newChain)
if err != nil {
t.Fatalf("DeleteChain of empty chain failed: %v", err)
}
}
func TestRules(t *testing.T) {
for _, ipt := range mustTestableIptables() {
runRulesTests(t, ipt)
}
}
func runRulesTests(t *testing.T, ipt *IPTables) {
t.Logf("testing iptables (hasWait=%t, hasCheck=%t)", ipt.hasWait, ipt.hasCheck)
chain := randChain(t)
// chain shouldn't exist, this will create new
err := ipt.ClearChain("filter", chain)
if err != nil {
t.Fatalf("ClearChain (of missing) failed: %v", err)
}
err = ipt.Append("filter", chain, "-s", "10.1.0.0/16", "-d", "8.8.8.8/32", "-j", "ACCEPT")
if err != nil {
t.Fatalf("Append failed: %v", err)
}
err = ipt.AppendUnique("filter", chain, "-s", "10.1.0.0/16", "-d", "8.8.8.8/32", "-j", "ACCEPT")
if err != nil {
t.Fatalf("AppendUnique failed: %v", err)
}
err = ipt.Append("filter", chain, "-s", "10.2.0.0/16", "-d", "8.8.8.8/32", "-j", "ACCEPT")
if err != nil {
t.Fatalf("Append failed: %v", err)
}
err = ipt.Insert("filter", chain, 2, "-s", "10.2.0.0/16", "-d", "9.9.9.9/32", "-j", "ACCEPT")
if err != nil {
t.Fatalf("Insert failed: %v", err)
}
err = ipt.Insert("filter", chain, 1, "-s", "10.1.0.0/16", "-d", "9.9.9.9/32", "-j", "ACCEPT")
if err != nil {
t.Fatalf("Insert failed: %v", err)
}
err = ipt.Delete("filter", chain, "-s", "10.1.0.0/16", "-d", "9.9.9.9/32", "-j", "ACCEPT")
if err != nil {
t.Fatalf("Delete failed: %v", err)
}
rules, err := ipt.List("filter", chain)
if err != nil {
t.Fatalf("List failed: %v", err)
}
expected := []string{
"-N " + chain,
"-A " + chain + " -s 10.1.0.0/16 -d 8.8.8.8/32 -j ACCEPT",
"-A " + chain + " -s 10.2.0.0/16 -d 9.9.9.9/32 -j ACCEPT",
"-A " + chain + " -s 10.2.0.0/16 -d 8.8.8.8/32 -j ACCEPT",
}
if !reflect.DeepEqual(rules, expected) {
t.Fatalf("List mismatch: \ngot %#v \nneed %#v", rules, expected)
}
// Clear the chain that was created.
err = ipt.ClearChain("filter", chain)
if err != nil {
t.Fatalf("Failed to clear test chain: %v", err)
}
// Delete the chain that was created
err = ipt.DeleteChain("filter", chain)
if err != nil {
t.Fatalf("Failed to delete test chain: %v", err)
}
}
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